Seesaw



Patented Mar. 20, 1928.

UNITED STATES PATENT OFFICE.

HARLAN A. YOUNG AND ARTHUR 'r. sHAxEsHA'r r. orrornn, xlmsAs.

SEESAW.

Application filed June 2', 1927. Serial No. 196,068.

This invention relates to see-saws or teeter-totters, and the general01)]8Ct of this invention is to provide a single see-saw of thischaracter wherein a compound lever vice that a floating motion is givento the seat as well as the jumping effect.

A still further object is to provide means whereby the parts'may beadjusted to increase or decrease the leverage and to adjust it for theheight of the child and according to the weight of the operator.

Our. invention is illustrated in the accompanying drawing, wherein 1 YFigure 1 is a side elevation of a single see-saw constructed inaccordance with our invention;

Figure 2 is a top plan view thereof;

Figure 3 is an end elevation.

Referring to the drawing, 10 designates longitudinal members whichconstitute stringers, and 11 designates transverse members whichconstitute a base or footing.

Mounted upon the transverse member 12 are the uprights 13 which are heldin upright position by means of the diagonal braces 14. These uprightmembers 13 are provided with an upper vertical series of holes 15 and alower vertical series of holes 16. Disposed betweenthe uprights andcoacting with the upper series of holes 16 is a top lever 17 havingthree longitudinally disposed holes 18 coacting with the holes 15 andthrough which a pivot pin is adapted to pass.

It will be seen from Figure 1 that the lever 17 is unequally pivoted andthe long arm lever is provided with an eye 20 with which a coiledcontractile spring 21 is engaged, the lower end of this spring beingconnected to an eye 22 mounted upon the footing 23. The opposite end ofthe lever 17 is provided with a transversely extending handle bar 24;.Having its end disposed between the uprights 13 is a seat supportinglever 25 which is provided in one end with an aperture adapted toregister with any one of the holes 16 and being pivoted upon a pin 26.At its opposite end this lever is provided with a seat 27 which may bewith or without a back and of any suitable construction.

Pivotally engaging. the lever 17 adjacent the handhold is a verticallink 28 and the lower end of this'link is perforated and theperforations are adapted to register with any one of a numberofperforations or apertures 29 through which a pivot pin may be passed. a

The operator sits on the seat 27, holding. his hands on the hand h0ld24.Theweightof the operator extends the counterbalancing spring 21 and theseat end of the lever 25 lowers until the operators feet touch-the baseor footing 11. The operator 'the'n' pushes against the base or footingwith his feet and the counterbalancing spring pulls him back until thespring is again fully contracted or in its normal position. Theoperators weight again lowers hlm to the floor and the process repeated.The machine bolt used as a pivot for the lever 17 maybe passed throughany one of the perforations 18 and the lower ends of the connecting rods28 may be bolted to the'bottom lever through any one of the perforations29. This enables the toy to be adjusted according to the weight of theoperator. Both the top and bottom levers may be raised or lowered byadjusting the pivot pins in the apertures 16 or 15 so that the seat maybe raised or lowered to suit the height of the operator.

It will be seen that we have provided a compound lever with ad'ustmentsfor weight by changing the ratio 0 either lever operating on the otherand that further we have provided means whereby the height of the seatmay be changed. The toy is light and compact in construction and may beused indoors or outdoors.

It will be obvious that many changes might be made in the details ofconstruction and arrangement of parts without departing from the spiritof the invention, and that the dimensions may be varied within widelimits to fit the device for children of different ages. The eyes 20 and22 are screw eyes and, therefore, adjustable so as to control thetension of the spring and to contract or extend the spring 21 in orderthat proper adjustment may be made for the height of the lever.

We claim 1. A single see-saw of the character described including abase, an upright, an u per lever having means whereby it may e,fulcrumed at a plurality of points upon the lever being connected tothe base by a coiled contractile spring, a second named lever dis posedbelow the rst and pivoted at its inner end to said upri ht and extendingaway from the spring, named lever being adjustable vertically upon theupright into a plurality of positions, and a link connecting the firstand second named levers.

2. A single see-saw ofthe character described including a base, a pairof uprights mounted thereon, the uprights being provided with a lowervertical series of apertures and with an upper vertical series ofapertures, an upper lever disposed between the uprights and having alongitudinal series of pivot pin apertures, a pivot pin passing throughany one of said apertures and any one of the upper series ofapertures inthe uprights, a coiled contractile spring connecting one end of saidlever to said base, a lower lever having one end inserted between theuprights, a pivot pin therefor engageable in any one of the second namedseries of apertures in the uprights, the second named lever having alongitudinal series of apertures intermediate its ends, and linkspivotally connected to the first named lever and pivotally connected tothe second named he fulcrum for the second lever at any one of saidapertures, the second named lever carrying a seat and the adjacent innerend vto said upright and extending away from the spring, the fulcrum'forthe second named lever being adjustable vertically upon the upright intoa plurality of positions, the fulcrum for the first named lever beingalso vertically adjustable, and a link connecting the first and secondnamed levers and being adjustable uponthe second named lever toward orfrom the fulcrum thereof.

In testimony whereof we hereunto affix our signatures.

HARLAN A. YOUNG.

ARTHUR 'r. SHAKESHAFT

